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Sep 14, 2015 at 15:01 comment added Zhentar @chris - By reading the specs for your furnace/blower, basically. You won't get an exact answer unless you measure the pressure across the blower, but it will still give you a fairly close estimate.
Sep 11, 2015 at 2:36 comment added TDHofstetter Cardboard box with most of the ends cut out and a weighted swinging flap hanging across the entire box. Calibrate it by holding out a car window while you drive at various speeds. Bingo, poor man's airflow meter.
Sep 11, 2015 at 0:28 comment added user39367 I like your answer but I am wondering, how would a homeowner measure airflow without an airflow meter (since an airflow meter is generally specialty equipment)? Do you have something in mind?
Sep 10, 2015 at 16:14 history answered Zhentar CC BY-SA 3.0